Re: [PARPORT] Bidirectional access to parallel port (JAVA)

From: Ramón Suárez Alvarez (
Date: Tue Mar 04 2003 - 12:11:27 EST

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    It doesn't work.

    If I try to set EPP mode, an exception is thrown.

    If I try to access to the FileInputStream, an exception is thrown.

    Looking in the sun help, only Error and buffer empty events have sent. Like
    in Windows platform. I am not be able to read anything from the parallel

    I am continuing investigation.

    Thank you.

    ----- Original Message -----
    From: "Andreas Fester" <>
    To: "Ramón Suárez Alvarez" <>; <>
    Sent: Tuesday, February 25, 2003 4:43 PM
    Subject: Re: [PARPORT] Bidirectional access to parallel port (JAVA)

    > Hi Ramón,
    > you could use the Java Communications API
    > (, but SUN only provides
    > drivers for Solaris and Windows. Maybe this package helps:
    > I have not tried it though, but it sais that it supports
    > IEEE1284 parallel ports.
    > Regards,
    > Andreas
    > Ramón Suárez Alvarez wrote:
    > > Hi all;
    > >
    > > I'm a newbie in this mailling list and I need some help with this
    > >
    > > I'm developing a program in Java to control a parallel printer, sending
    > > directly to the printer it's escape sequences docummented by the printer
    > > manufacturer.
    > >
    > > In Windows I had a sys file provided by the printer manufacturer and
    > > CreateFile, ReadFile and WriteFile, I sent commands to the printer
    > > problems. Now, I need to do the same in Linux. Reading in Internet, I
    > > that it's possible to use directly the lp device and, from Java, using
    > > FileInputStream and FileOutputStrem objets, open, read and write the
    > > /dev/lp0. But it doesn't work. I be able to write but trying to read, I
    > > receive exceptions. The question is:
    > >
    > > How can I use the parallel port as a bidirectional port? Do I need to
    > > something special to use the standard parallel port driver in linux? Do
    > > need to write some c code to access to the port and then make a JNI
    > > from Java to this c code? any idea?

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